SUPOW&reg; Water Bottle Holder Cage - Aluminium Alloy Lightweight Economic Bike Rack Handlebar Accessory for Bike Bicycle Cycling Outdoor Sports Material : Aluminum alloy Suitable for all kinds of bicycle water bottle (opening size can be manually earpieces) Suitable for road bikes, mountain bikes, station wagon (handlebar diameter of 22.2 MM) The water bottle cage has arms that wrap around the bottle for a secure and firm hold Note: when the kettle frame of choose and buy must pay attention to the size is consistent with the kettle, might also notice the kettle for scratches and other damage